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Analog Devices Inc./Maxim Integrated MAX118CAI+
- Part No.:
- MAX118CAI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX118CAI+.pdf
- Description:
- IC ADC 8BIT FLASH 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,277
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Product details
Overview
The MAX118CAI+ from Maxim Integrated is an 8-bit, 8-channel analog-to-digital converter (ADC) designed for microprocessor interfacing. It operates from a single +5V supply, achieves 1Msps sampling rate with 660ns conversion time, features internal track/hold and 1µA power-down current, and is used in high-speed data acquisition systems requiring low-power burst-mode operation.
For engineers reviewing the MAX118CAI+ datasheet, MAX118CAI+ pinout, MAX118CAI+ application, or MAX118CAI+ equivalent, this page delivers verified technical context, real-world interface timing constraints, ratiometric reference configuration details, and validated alternative options for industrial and portable measurement designs.
Technical Context
The MAX118CAI+ uses a half-flash architecture with two cascaded 4-bit flash ADC sections and an internal DAC to generate the full 8-bit result. Its analog multiplexer selects among eight input channels under A0–A2 address control, with IN8 hardwired to monitor REF+ voltage.
Digital interface supports two modes: read mode (MODE = GND) using RD as conversion trigger and RDY status output, and write-read mode (MODE = VDD) using WR to initiate conversion and INT to signal completion. Pipelined operation is enabled by tying WR to RD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete digital codes across full-scale input range |
| Sampling Rate | 1Msps - supports up to one million conversions per second in WR-RD mode with tRD < tINTL |
| Conversion Time | 660ns - fixed latency from WR/RD assertion to valid data availability |
| Total Unadjusted Error | ≤ ±1LSB - ensures monotonicity and no missing codes over temperature and supply range |
| Power-Down Current | 1µA typical - enables ultra-low quiescent power in standby between burst measurements |
| Input Full-Power Bandwidth | 1MHz - supports accurate digitization of fast-rising analog signals without slew-induced error |
| SINAD | 45dB at 195.8kHz input - defines effective resolution of ~7.2 bits for sinusoidal inputs |
Pinout & Package
The MAX118CAI+ is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.635mm pitch, JEDEC MO-153 compliant, body size 10.2mm × 5.3mm, and exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 24) | Positive supply input | Accepts +4.75V to +5.25V; requires 4.7µF + 0.1µF bypassing to GND |
| GND (Pin 12) | Ground reference | Common return for analog/digital supplies and reference circuitry |
| REF+ (Pin 14) | Reference voltage upper bound | Sets full-scale code (11111111); internally connected to IN8; range: GND < VREF+ ≤ VDD |
| REF- (Pin 13) | Reference voltage lower bound | Sets zero-code voltage (00000000); range: GND ≤ VREF- < VREF+ |
| IN1–IN7 (Pins 1–4, 21–23, 25–26) | Analog input channels | Seven user-accessible differential-capable inputs; each protected by ±0.3V clamping diodes |
| IN8 (internally connected) | Fixed reference monitor | Always reads REF+ voltage when selected via A2/A1/A0 = 111; not externally accessible |
| A0–A2 (Pins 22–21, 20) | Multiplexer address inputs | Select one of eight analog channels (000–111); must be stable ≥160ns before conversion start |
| CS (Pin 16) | Chip-select enable | Active-low; must be low for WR/RD/PWRDN to be recognized; resets INT on rising edge |
| RD (Pin 10) | Read strobe / data access | In read mode: initiates conversion and enables D0–D7 outputs; in WR-RD mode: latches LSBs |
| WR/RDY (Pin 15) | Write strobe or ready status | In read mode: open-collector RDY output (low = conversion complete); in WR-RD mode: WR input |
| INT (Pin 11) | Interrupt output | Active-low open-collector flag signaling end of conversion; reset by rising edge of CS or RD |
| PWRDN (Pin 23) | Power-down control | Logic low reduces VDD current to 1µA; wake-up time <200ns; must be driven to rail in sleep |
| MODE (Pin 5) | Interface mode select | Low = read mode (RD-triggered); high = write-read mode (WR-triggered); internally pulled down |
| D0–D7 (Pins 6, 7–9, 17–20) | Three-state parallel data bus | CMOS-compatible 8-bit output; latched and held during conversion; high-impedance when CS high |
Key Features
| Feature | Design Value |
|---|---|
| Half-flash conversion architecture | Enables 660ns conversion with only 15 comparators and minimal die area vs. full flash |
| Internal track/hold circuit | Eliminates need for external sample-and-hold; acquires signal within 360ns after wake-up |
| Ratiometric reference configuration | Allows direct use of system supply as REF+, making ADC insensitive to VDD drift |
| 1µA power-down current | Reduces average power to µW-level in burst-mode systems with infrequent sampling |
| No external clock required | Self-timed conversion eliminates clock distribution, jitter, and layout complexity |
| Microprocessor-compatible interface | Appears as memory-mapped I/O or port-mapped device without glue logic |
Applications
| High-Speed DSP Front-End | Remote Sensor Data Acquisition |
|---|---|
|
Use Scenario: Digitizing multi-channel sensor outputs (e.g., vibration, temperature, pressure) in field-deployed industrial nodes with battery or energy-harvesting power. IC Role / Device Role / Timing Role: 8-channel simultaneous-sampling-capable ADC providing synchronized 1Msps conversion for real-time FFT analysis. Use Value: Internal track/hold and 1µA power-down enable precise capture during short wake-up windows, extending node lifetime. |
Use Scenario: Collecting analog telemetry from distributed environmental sensors (e.g., soil moisture, air quality) over RS-485 or LoRaWAN links. IC Role / Device Role / Timing Role: Low-power ADC interfaced to an MCU that wakes periodically to sample all 8 channels and transmit compressed data. Use Value: Ratiometric operation ensures accuracy despite battery voltage sag; 660ns conversion minimizes active time per sample. |
| Portable Test Equipment | Communications System Monitoring |
|
Use Scenario: Handheld oscilloscope or multimeter capturing transient waveforms with minimal form factor and thermal budget. IC Role / Device Role / Timing Role: Primary digitizer feeding FPGA or DSP; uses pipelined WR=RD mode to sustain continuous 1Msps streaming. Use Value: Single +5V supply simplifies power design; SSOP package enables compact PCB layout with low parasitic capacitance. |
Use Scenario: Monitoring RF front-end bias voltages, PA temperature, and signal chain gain settings in base station transceivers. IC Role / Device Role / Timing Role: Supervisory ADC scanning 8 critical analog points every 10ms to feed closed-loop calibration algorithms. Use Value: IN8 monitoring of REF+ provides built-in reference health check; ±1LSB TUE ensures reliable fault detection thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit, multi-channel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX118CPI+ | Same silicon, 28-pin wide plastic DIP package; 2.54mm pitch; higher thermal resistance (1.14W max @ +70°C) | Preferred for through-hole prototyping or legacy board compatibility; less suitable for high-density layouts | Select MAX118CPI+ when manual assembly, socketing, or mechanical robustness outweighs size constraints. |
| ADS7822U | TI 8-bit, 200ksps SAR ADC; SPI interface; 2.7–5.25V supply; 12µA power-down; no internal track/hold | Lower speed, serial interface, no channel multiplexing flexibility; requires external S/H for >100kHz signals | Choose ADS7822U only if SPI bus availability, lower cost, and relaxed speed requirements justify trade-offs in latency and analog support. |
Compared with MAX118CPI+ and ADS7822U, the MAX118CAI+ uniquely combines 1Msps parallel-interface performance, integrated track/hold, and sub-µA power-down in a space-efficient SSOP-making it optimal for compact, high-throughput embedded data loggers.
Availability
The MAX118CAI+ is available at Aetrix Electronics and suitable for high-speed data acquisition, portable instrumentation, and remote sensor monitoring requiring stable component supply across industrial temperature ranges.
Supply support for MAX118CAI+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) is a fabless semiconductor company specializing in precision analog, mixed-signal, and high-frequency ICs for industrial, communications, and computing markets.
The MAX118CAI+ belongs to Maxim's high-speed data converter product line, engineered for microprocessor-based systems needing fast, low-power, multi-channel digitization without external timing or support components.
FAQ
What is the operating temperature range for the MAX118CAI+?
The MAX118CAI+ is rated for commercial temperature operation from 0°C to +70°C. This range is confirmed in the Ordering Information table where "CAI" suffix denotes the 0°C to +70°C grade in 28-pin SSOP packaging. It is not rated for extended or military temperature ranges.
Does the MAX118CAI+ require an external clock source?
No, the MAX118CAI+ does not require an external clock. Its half-flash architecture and internal timing control enable self-contained 660ns conversion cycles. All timing is derived from internal logic; only control signals (CS, RD, WR, PWRDN) need to be asserted per the specified setup/hold windows.
How does the IN8 channel function in the MAX118CAI+?
In the MAX118CAI+, IN8 is an internally hardwired channel that always monitors the REF+ voltage when selected via A2/A1/A0 = 111. It is not connected to an external pin and cannot be used for general-purpose analog input. This feature allows real-time verification of reference stability during operation.
What is the minimum acquisition time (tACQ) requirement for the MAX118CAI+?
The MAX118CAI+ requires a minimum acquisition time of 160ns, defined as the interval from address validity (A0–A2 stable) to the start of conversion (falling edge of RD or WR). This value is specified in the Timing Characteristics table for all grades at TA = +25°C and holds across the full 0°C to +70°C range.
Can the MAX118CAI+ operate with a 3V supply?
No, the MAX118CAI+ is specified only for single +5V operation (4.75V to 5.25V). For +3V applications, Maxim documents the pin-compatible MAX117 family (e.g., MAX117CAI+) - which shares architecture and interface but is optimized for 2.7V–3.6V supply rails and exhibits different dynamic performance.
MAX118CAI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Flash
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- Selectable Address
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX118CAI+ FAQ
1.How can I place an order for MAX118CAI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX118CAI+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX118CAI+ reliable?
The price and inventory of MAX118CAI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX118CAI+ is usually 5 days.
3.What payment methods are accepted for MAX118CAI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX118CAI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX118CAI+?
MAX118CAI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX118CAI+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX118CAI+?
For technical support, including MAX118CAI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX118CAI+ requirements.
6.How does Aetrix verify that MAX118CAI+ is sourced from the original manufacturer or authorized distributors?
All MAX118CAI+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX118CAI+ meets industry standards.
7.What is the process for return or replacement of MAX118CAI+?
All MAX118CAI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX118CAI+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX118CAI+ part is unused and in its original packaging.
Return procedure for MAX118CAI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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